The difference is that it relies on radiation instead of heat.

所不同的是，它依靠辐射而非热量。

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The copper plates conducted heat rapidly to and from the bismuth telluride, thus maintaining the temperature difference.

铜片可以把热量迅速地传递到碲化铋上或从碲化铋上导出，这样就能保持气温差。

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The system also cools the air around the water, creating a bigger temperature difference so it can absorb more heat from the outside air.

这个系统同样也给水周围的空气降温，产生出更高的温度差，这样它就能从外部空气中吸收更多的热量。

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for instance, for the thermos with the coffee in if you place the boundary in the inside wall of the glass or the outside wall of the glass and the inside of the thermos, that makes a difference; different heat capacity, etcetera.

比如说，对于装咖啡的热水瓶来说,你把边界设置在瓶胆的内壁上,或者设置在瓶胆外壁上,或设在热水瓶里面，情况都是不一样的;,有不同的热容等等。

麻省理工公开课 - 热力学与动力学课程节选

We can tabulate them. We can know them, and then when we have reactions that inter-convert different compounds, we can calculate the heat of reaction is just the difference between the heat of formation of the reactants, and the heat of formation of the products, right.

种化合物的生成热，可以把它们列成表,可以认知它们，而当我们要处理，在不同化合物间转变的反应时,我们只要计算反应物和,生成物的生成热之间的不同,就能计算出反应热。

麻省理工公开课 - 热力学与动力学课程节选

The ability to deal with extreme heat can mean the difference between victory and defeat.

CNN: Silver secret behind golden hopes

These pens would bob 60 feet below the surface, kept in place with motors powered by heat exchangers that use the temperature difference between deep water and shallow water to generate electricity.

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The difference is that energy normally lost through heat in the latter two scenarios is now recovered.

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